get the bottom of the door where you need it by adjusting the hinges in or out on the pillar, may have to oblong some holes especially if you have done some work in the area. this will get the door in or out at the front edge compared to the body.the rear edge is done with the door latch. sliding the door forward or aft is done with the adjustments where the hinge bolts to the door. get it right for the lower section, where the big sheet metal is, then adjust the top by the wood method or the knee method if it has to come in some. adjusting the lower hinge further out and leaving the upper hinge will result in the top section of the door going in at the top. like a see saw effect. don't worry about weather stripping fitting, it will fit if the door is correct with the body. for weatherstrip use a good soft brand, like soffseal, the cheaper ones will not let the door close. trust me.
remember, these doors didn't fit great when new so if you don't have the original doors for the cab, from factory, they will be even worse maybe because they were fit to something else. some guys have added welding or ground down the edges of the doors then welded the crack back up, just to get the gaps proper. it's a whole thing on the build cycle of the truck if you want it to look awesome. some don't mind a little rubbing or wind noise. it depends on you and your tastes.
https://www.soffseal.com/